4 Elements Yagiat 157.000 Mhz measurements and spacing.
This antenna is 4 elements yagi built for the frequency 157.000 Mhz, in the Philippines most of the users of this frequency bands are Government Organizations, LGU’s, Civic Groups, Fire volunteers and the like. Although most of the requested antenna designs fall on the Amateur Band (144.000 Mhz to 146.000 Mhz) frequency. I decided to published the details of this antenna although not frequently requested. The details of the build is similar to building the 4 Elements Yagi for Amateur Frequency. Elements measurements and spacing are of course adjusted to resonate properly on the 157.000 Mhz band.
Antenna Center frequency 157.000 Mhz
Lowest usable band 152.000 Mhz
Highest usable band 160.000 Mhz
Antenna Gain: 9.52dBi
F/B ratio: 9.87dB
Beamwidth: 60° Vertical / 24° Horizontal
Expected Antenna Pattern Generated by 4NEC2
Antenna Pattern Vertical
Horizontal Antenna Pattern
Download PDF Document antenna measurements here.
1. 1″ X 0.5″ Rectangular Aluminum tubing for the boom
2. 3/8″ Aluminum tubing for antenna elements
3. 1cm Outside diameter antenna tubing for elements holder
4. 1pc SO239 connector
5. Pop rivets / Rivet tool
6. #12 AWG Copper wire with insulation (12″for Gamma match)
7. Soldering iron
8. 8pcs Stainless steel nuts and bolts 20mm length 3mm diameter
9. 1, Butterfly nut and 1 bolt 18mm length 3mm diameter
10. Aluminum plate 0.5mm thickness
11. Collapsible tube (shrinkable tubes)
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View Comments
Dear Ephraim,
Thank you very much for sharing this information.
I have been looking for something like this for a while.
I am a member of a search & rescue team in California.
We do a lot of up canyon work using vertical antennas in the 155Mhz range with moderate success but I suspect that a beam antenna would work MUCH better.
Again, thank you for your fine work.
Regards,
Mark.
KC6OVH
San Bernardino Search & Rescue